I'm 5'1" and 135# and I ordered a Medium. The tank fits well - it's a little roomy in the chest for me, but sits well on my shoulders, and the neck doesn't sag even though it's a little more loose up top. The arm holes are slightly over-sized, so my sports bra peeks through the sides and back a little (I don't mind this) It's also a very lightweight fabric, so I will probably use it for lounging or working out. Definitely a comfy piece, but might order a Small as well to see if it fits better.
Rating:
[4 of 5 Stars!]